I have a 2006 nissan maxima 3.5 sl ... im having problems starting the car, and when it does finally start it starts in 5th gear. i noticed that the only time it starts in 5th gear is when i am at a quarter tank or less of gas. When it starts in 5th gear it wont get past 2000 rpm"s. Also Ill be driving foot on gas trying to maintain a certain speed and my rpm"s will drop from 2500 rpm's to 1000 rpm's then back up to 3000 rpm's...
Hello
The engine
and automatic transmission in this vehicles drive train
are fully electronically controlled by a computer called the PCM
(Power Train Control Module). Whenever a problem like this occurs the
computer stores a record of the problem (there are of course some
exceptions to this, like the fuel pump, engine coolant temperature
sensor and MAF sensor for instance) in the form of a fault code in
its memory, to read these fault codes you must have the systems
memory scanned with a special tool. Once the fault code(s) are read
you then must perform the appropriate diagnostic testing to find and
resolve the problem(s) DO NOT REPLACE ANY PARTS UNTIL A
TRAINED TECHNICAIN HAS DIAGNOSED THE PROBLEM TO AVOID SPENDING YOUR
HARD EARNED MONEY ON PARTS THAT MAY NOT CORRECT THE PROBLEM
SOURCE: EGR Flow and Knock sensor 1
Hi
The EGR valve allows a percentage of exhaust gas back into the engine during part throttle driving conditions. The exhaust gas enters the combustion process and cools the charge down slightly which lowers the emissions.
The EGR flow malfunction is usually rectified by removing the EGR valve and cleaning out the valve itself and the port(s) on the intake where it was sat, which have probably become narrowed due to all the deposits. You need to use a piece of wire to get right into the ports and clean them right out. The valve is connected to both the intake manifold and the exhaust, it is round and will have a vacuum pipe to it. It will either be mounted directly on the intake manifold, or linked to it via a hose, probably metal, and it will be linked to the exhaust via a hose, probably metal.
The knock sensor listens for engine knock, usually caused by incomplete combustion or over advanced ignition timing, and retards the ignition timing to counteract the knock.
You very highly likely have a faulty sensor, but check the wiring first. To suss the problem properly you would need to have alive scan carried out.
Knock sensors are usually located under the intake manifold on these cars and are a complete pain to get to. You'll probably need a universal joint type of affair to get it off. They held on with one bolt.
Very best regards
Geordie
SOURCE: stick shift # Automatic RPM
The gear ratios on a manual transmission are fixed, that's why it's a manual. If you get 3000 rpm at 75 mph, that means you will see 3200 rpm at 80 mph, 3400 rpm at 85 mph, etc. The two quantities are directly proportional, a fixed ratio for each gear. You would get a lower rpm with a 6-speed manual but still it's a fixed ratio.
On a car with automatic transmission, it can be more complicated. Most transmissions nowadays have various "overdrive" modes that keep the rpm low if you're going steady at a high speed. Some even have continuous gear ratios, so it's hard to say "what gear" you are really in. In general, the rpm will be lower on the highway with an automatic and that's normal.
SOURCE: i have a 2000 nissan maxima and the problem that i
Idle air control valves short out all the time on these models. You can ohm the motor to check it, but the down side to a shorted iac valve is that it shorts out the ecm if not repaired quickly. when the valve shorts, 12 volts is supplied directly to the ecm and burns the circuit board. The other option is the air flow meter, this is also a very common problem but typically a p0171/p0174 would be stored in self diag.
SOURCE: The RPM of Nissan Altima stays high when drive over 65 MPH.
No....the rpms differ from engine to engine and from manufacturer to manufacturer. RPM's are always higher at higher speeds.
Testimonial: "thank you very much"
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